This Cummins intake manifold pressure document is a troubleshooting procedure for Fault Code 125 on ISB6.7 CM2350 engines. It explains an amber-lamp condition where intake manifold pressure data is valid but below the normal operating range, then gives diagnostic checks for air handling, EGR plumbing, sensor comparison, ECM calibration, and fault clearing.
Official Cummins intake manifold pressure document details
| Brand | Cummins |
|---|---|
| Model coverage | ISB6.7 CM2350, 2013-17 |
| System/Group | DTCs; intake manifold 1 pressure; air intake, charge-air, EGR, sensor, and ECM calibration checks |
| Year/Revision | Copyright © 2017; specific model year unknown |
| Pages | 6 |
| File size | 0.1 MB |
| Format | |
| Language | English |
Document table of contents
- Fault Code: 125; PID: 102; SPN: 102; FMI: 18; LAMP: Amber
- Circuit Description
- Component Location
- Reason
- Effect
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Troubleshooting Steps
- Step 1A: Check for active fault codes
- Step 1B: Check for active fault codes related to the turbocharger or EGR valve
- Step 2A: Check the charge-air cooler and charge-air plumbing for leaks
- Step 2B: Check for a restricted charge-air cooler
- Step 2C: Check the EGR system for leaks and restrictions
- Step 3A: Check the intake manifold pressure sensor
- Step 4A: Check if an Engine Control Module calibration update is available
- Step 4B: Disable the fault code
Applicable truck models
This file applies to Cummins ISB6.7 CM2350 engines from the 2013-17 coverage group where Fault Code 125 is used for Intake Manifold 1 Pressure – Data Valid but Below Normal Operating Range – Moderately Severe Level. The extract identifies the intake manifold 1 pressure/temperature sensor in the air intake horn and covers diagnosis using a diagnostic tool, mechanical intake manifold pressure gauge, charge-air cooler inspection, EGR system inspection, and ECM calibration review. For manufacturer information, visit Cummins official website.
Who needs this Cummins intake manifold pressure manual
This manual is for diesel mechanics, diagnostic technicians, and workshop owners tracing low boost pressure complaints, amber CHECK ENGINE lamp events, reduced engine performance, EGR-disabled operation, or repeated Fault Code 125 records on supported ISB6.7 CM2350 engines. It is useful before replacing parts because the procedure separates charge-air leaks, charge-air cooler restriction, EGR leaks or restrictions, sensor error, fuel inlet restriction possibilities, and calibration status.
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